Effect of Draw Ratio on the Morphologies and Properties of BPDA/PMDA/ODA Polyimide Fibers

doi:10.1007/s40242-014-3266-0

Chemical Research in Chinese Universities ›› 2014, Vol. 30 ›› Issue (1): 163-167.doi: 10.1007/s40242-014-3266-0

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Effect of Draw Ratio on the Morphologies and Properties of BPDA/PMDA/ODA Polyimide Fibers

ZHANG Chunling^1,2, ZHANG Qiong^1,2, XUE Yanhu³, LI Guomin², LIU Fangfang², QIU Xuepeng², JI Xiangling³, GAO Lianxun²

1. College of Materials Science and Engineering, Jilin University, Changchun 130025, P. R. China;
2. Polymer Composite Engineering Laboratory, Chinese Academy of Sciences, Changchun 130022, P. R. China;
3. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China

Received:2013-06-21 Revised:2013-10-02 Online:2014-02-01 Published:2013-10-11
Contact: QIU Xuepeng,E-mail:xp_q@ciac.jl.cn E-mail:xp_q@ciac.jl.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.51173178), the National Basic Research Program of China(No.2014CB643600), the Project of the Science and Technology Bureau of Changchun City, China(No.11GH03), the Development Project of Jilin Province Science and Technology, China(No.20130413048GH) and the International Cooperative Project of Science and Technology Bureau of Changchun City, China(No.2010064).

Abstract

Abstract:

3,3,4,4-Biphenyltetracarboxylic dianhydride/pyromellitic dianhydride/4,4-oxydianiline(BPDA/PMDA/ ODA) polyimide copolymer fibers with different draw ratios were prepared from the imidization of polyacrylic acid(PAA) fibers via a dry-jet wet-spinning process. Their morphologies, microcrystal orientations, thermal stabilities, and mechanical properties were investigated via scanning electron microscopy(SEM), wide angle X-ray diffraction(WAXD), thermogravimetric analysis(TGA), and tensile experiments. In order to acquire fibers with better mechanical performance, we aimed at obtaining the optimal draw ratio. Drawing during thermal imidization resulted in a decreased diameter of fiber from 25.8 μm to 16.9 μm corresponding to draw ratio from 1 to 3.5. WAXD results show that the degree of the orientation of the undrawn sample is 64.1%, whereas that of the drawn sample is up to 82%. The as-spun fiber and those with different draw ratios all exhibit high thermal stabilities, i.e., the temperature at a mass loss of 5% can reach as high as 570 ℃. The tensile strengths and tensile modulus of the fibers increase with the draw ratios, and the maximum tensile strength and modulus are 0.90 and 12.61 GPa, respectively.

Key words: Polyimide, Draw ratio, Morphology, Orientation, Mechanical property

ZHANG Chunling, ZHANG Qiong, XUE Yanhu, LI Guomin, LIU Fangfang, QIU Xuepeng, JI Xiangling, GAO Lianxun. Effect of Draw Ratio on the Morphologies and Properties of BPDA/PMDA/ODA Polyimide Fibers[J]. Chemical Research in Chinese Universities, 2014, 30(1): 163-167.

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Effect of Draw Ratio on the Morphologies and Properties of BPDA/PMDA/ODA Polyimide Fibers

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